Sole for a boot, and a boot having such sole

ABSTRACT

A sole for a boot, as well as a boot having such sole, for walking on ice and/or snow having, in at least a central zone of the walking surface, a series of strips that are contiguous at rest, and crampons at its outer periphery. Each series of strips is interrupted by channels extending both in the transverse and longitudinal directions, and each crampon has a channel for evacuating water.

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application is based upon French Patent Application No. 01.15210, filed Nov. 21, 2001, the disclosure of which is hereby incorporated by reference thereto in its entirety, and the priority of which is hereby claimed under 35 U.S.C. §119.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a boot sole adapted for walking on ice, or on icy and/or snow-covered ground, as well as to a boot having such a sole.

[0004] 2. Description of Background and Relevant Information

[0005] In order to solve the drawback of walking on icy ground, it is known from CH 172 710 and CH 218 631 to fit the periphery of the sole with metal fittings or nails allowing for a better grip on ice. However, these nails and fittings have the drawback of being slippery on other surfaces, such as macadam, cement, or rocky ground.

[0006] Also, the fittings are not efficient for walking on snow-covered ground because snow adheres to the sole, gets caught between the fittings, and quickly forms clogs, making the fittings inefficient.

[0007] More recently, document JP 10337203 proposed including glass fibers in the sole, oriented and exposed toward the ground contact surface, so as to obtain an anti-slip effect on an icy or snow-covered surface.

[0008] This type of sole has the drawback of having a very high production cost.

[0009] In order to walk on smooth, slippery surfaces, such as wet or icy ground, document EP 682 886 discloses equipping the sole with peripheral profiled blocks provided with strips, the height thereof corresponding to the total height of the block. This type of boot is not very adapted to a combined use on snow and ice or to non-flat surfaces. Additionally, the significant depth of the strips makes them very sensitive to wear.

SUMMARY OF THE INVENTION

[0010] The present invention is provided for overcoming the aforementioned drawbacks and to propose, at a profitable cost, a sole allowing one to walk on ice as well as on snow, even over uneven ground, and avoiding the drawbacks of snow build-up.

[0011] The sole of the invention, for walking on ice has, in at least a central zone of the walking surface, a series of strips that are contiguous at rest, and crampons at its outer periphery.

[0012] It was surprisingly noted that the strips that are contiguous at rest and arranged in a central zone of the sole, allow one to have a good adherence to ice when walking, whereas the peripheral crampons allow for a good grip on snow.

BRIEF DESCRIPRION OF DRAWINGS

[0013] The invention will be better understood and other features thereof will become apparent from the following description, with reference to the attached schematic drawings, and in which:

[0014]FIG. 1 is a bottom view of a sole according to a first embodiment;

[0015]FIG. 2 is a view similar to FIG. 1 of a sole according to a second embodiment;

[0016]FIG. 3 is a schematic side view showing the functioning of the lateral crampons;

[0017]FIG. 4 is a cross-sectional schematic view along the line IV-IV of FIG. 1, the strips being at rest;

[0018]FIG. 5 is a schematic view similar to FIG. 4 showing the functioning of the strips when walking;

[0019]FIG. 6 is a detailed perspective view of FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

[0020] As shown in FIG. 1, the walking sole 1 according to the invention includes two central zones, front central zone 2 and rear central zone 3, respectively, each having a series or block of strips 10, completely contiguous, i.e., leaving no interval between two adjacent strips at rest.

[0021] In the example shown, each of the strips 10 is substantially straight and extends in a direction D substantially transverse to the longitudinal axis L of the sole.

[0022] Each block 2, 3 of strips 10 is furthermore surrounded by peripheral crampons 20, i.e., crampons that are flush with the edge of the sole and that are described further detail below.

[0023] The strips 10 are made of a polymeric material, for example, a rubber-like material having a low hardness, preferably on the order of 55 shore A, and whose hardness varies little at low temperatures, down to approximately −20° C.

[0024] According to the invention, this material can be a rubber, but a polymer such as polyurethane, particularly expanded polyurethane having the desired properties of hardness and low variation at low temperature, is encompassed within the scope of the invention.

[0025] The strips 10 are cut with an appropriate sharp tool, having very thin blades, such as cutter blades.

[0026] According to a particular embodiment, each strip has a depth of approximately 4 millimeters (mm) and a width of approximately 2 mm for a block 2, 3 height of approximately 6 mm. Other dimensional features can be provided, particularly depending on the material constituting these soles and the temperature range of use. According to the invention, the strips 10 have a depth that does not exceed three-fourths of the height of the associated block 2, 3, so as to limit wear on these strips and to avoid a premature wear. Nevertheless, this relative depth could be increased according to the scope of the invention, depending on the effect desired.

[0027]FIGS. 4 and 5 show the functioning of the strips 10. At rest, i.e., without any load as shown in FIG. 4, the spacing “e” between two successive strips is zero and the strips 10 seem to be completely contiguous. As shown in FIG. 4, the strips 10 are completely parallel and substantially straight at rest.

[0028] When the wearer walks, tangential forces T occur, the strips 10 then deform elastically as shown in “d” in FIG. 5 and oppose the slipping of the sole, even on ice.

[0029] Furthermore, because the strips 10 are very close to each other, one avoids the effect of snow accumulation or build-up that is known in prior systems, and the effect of resistance to slipping does not change over time.

[0030] Preferably, as shown more particularly in FIG. 6, channels 15 and 16 having a smaller depth than that of the strips 10, in this case, a depth approximately equal to 2 mm or 3 mm, are provided to evacuate the water that forms when rubbing the sole over ice or to break this film of water.

[0031] In the example of FIG. 1, the channels 15 and 16 are longitudinal but other shapes can also be envisioned, such as those described below.

[0032] The peripheral crampons 20 are, contrary to the strips 10, widely spaced apart so as to provide a “serrated” type of hold. In other words, and as shown in FIG. 3, during the rolling movement of the foot when walking (arrow M), the first crampons 21 work rearwardly from the top down (arrow C) by compacting the snow, then the next crampons 22 shear it (arrow S) to provide the desired grip on the snow.

[0033] These crampons 20 preferably have a shape that is very “square,” substantially rectangular, with numerous straight edges 25 for an optimal grip. Each crampon 20 is furthermore provided with at least one channel 26 for evacuating water. Each crampon 20 has a longitudinal dimension of approximately 10-15 mm and a transverse direction varying between 20 mm and 40 mm. Two successive crampons are separated by approximately 10 mm, so as to have the desired effect of a serrated grip. Thus, the strips 10 and the crampons 20 cooperate for an optimal hold on snow and on ice.

[0034] The crampons 20 are preferably made of the same material as the strips 10. As the case may be and depending on the effect sought, such as, for instance, a use on a very soft snow, the crampons 20 could be made of a harder polymeric material, up to 70 shore A.

[0035] The strips 10 can be straight as shown in FIG. 1. However, they will preferably have a sinusoidal type shape in order to provide a grip in different directions.

[0036]FIG. 2 shows a preferred embodiment in which the strips 10 are V-shaped/chevron-shaped, i.e., oriented according to a triangle. In this case, the strips 10 of the rear block 3 are oriented opposite the strips of the front block 2 in order to have a braking action during the driving, or thrusting, force of the heel.

[0037] In the example of FIG. 2, one can also note the shape of the evacuation channels 15, 16 that extend both in the longitudinal direction L as well as in the transverse direction D.

[0038] The present invention is not limited to the previously described particular embodiments given by way of non-limiting examples, but it encompasses all similar or equivalent embodiments. 

What is claimed is:
 1. A sole for walking on ice and/or snow, said sole comprising: a walking surface having a central zone and an outer periphery; a series of strips in at least said central zone of said walking surface, said series of strips being contiguous at rest; crampons at said outer periphery of said walking surface.
 2. A sole according to claim 1, wherein the said strips extend in a direction substantially transverse with respect to a longitudinal axis of the sole.
 3. A sole according to claim 1, wherein said strips are substantially straight.
 4. A sole according to claim 1, wherein said strips are V-shaped/chevron-shaped.
 5. A sole according to claim 1, wherein said central zone comprises a front central zone.
 6. A sole according to claim 1, wherein said central zone comprises a rear central zone.
 7. A sole according to claim 5, wherein the said central zone comprises a front central zone and a rear central zone, said series of strips being in said front central zone, the sole further comprising a series of strips in said rear central zone.
 8. A sole according to claim 1, wherein each said strip in said series of strips has a width of approximately 2 mm.
 9. A sole according to claim 1, wherein each said strip in said series of strips has a depth of approximately 4 mm.
 10. A sole according to claim 8, wherein each said strip in said series of strips has a depth of approximately 4 mm.
 11. A sole according to claim 1, wherein each of said series of strips is interrupted by channels extending both in transverse and longitudinal directions.
 12. A sole according to claim 11, wherein each said channel has a maximum depth of approximately 3 mm.
 13. A sole according to claim 1, wherein the sole is constituted of a polymer material having a hardness of approximately 55 shore A.
 14. A sole according to claim 1, wherein each said crampon includes a channel for evacuating water.
 15. A boot comprising: an external sole for walking on ice and/or snow, said sole having a walking surface, said walking surface having a central zone and an outer periphery; in at least said central zone of said walking surface, said sole comprising a series of strips, said series of strips being contiguous at rest; and at said outer periphery of said walking surface, said sole further comprises crampons. 